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media-session: add device reservation for alsa

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Implement the device reservation DBus API.

When we acquire the device name, set our device profile to 'On'. This
adds our sources and sinks to the graph.

When we lose the name, switch back to 'Off' and remove our nodes
again.

Move the session mamager stuff in a directory.

Fixes #191
This commit is contained in:
Wim Taymans 2019-09-30 21:23:29 +02:00
parent 96ac81958b
commit dc83c10c9a
8 changed files with 672 additions and 8 deletions
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78
src/examples/media-session/reserve.h Normal file
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/* DBus device reservation API
*
* Copyright © 2019 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef DEVICE_RESERVE_H
#define DEVICE_RESERVE_H
#include <dbus/dbus.h>
#include <inttypes.h>
#ifdef __cplusplus
extern "C" {
#endif
struct rd_device;
struct rd_device_callbacks {
/** the device is acquired */
void (*acquired) (void *data, struct rd_device *d);
/** request a release of the device */
void (*release) (void *data, struct rd_device *d, int forced);
};
/* create a new device and start watching */
struct rd_device *
rd_device_new(DBusConnection *connection, /**< Bus to watch */
const char *device_name, /**< The device to lock, e.g. "Audio0" */
const char *application_name, /**< A human readable name of the application,
* e.g. "PipeWire Server" */
int32_t priority, /**< The priority for this application.
* If unsure use 0 */
const struct rd_device_callbacks *callbacks, /**< Called when device name is acquired/released */
void *data);
/** try to acquire the device */
int rd_device_request_acquire(struct rd_device *d);
/** request the owner to release the device */
int rd_device_request_release(struct rd_device *d);
/** complete the release of the device */
int rd_device_complete_release(struct rd_device *d, int res);
/** release a device */
void rd_device_release(struct rd_device *d);
/** destroy a device */
void rd_device_destroy(struct rd_device *d);
/* Set the application device name for an rd_device object. Returns 0
* on success, a negative errno style return value on error. */
int rd_device_set_application_device_name(struct rd_device *d, const char *name);
#ifdef __cplusplus
}
#endif
#endif